---
type: source
title: "DARPA Issues Urgent Call for He-3-Free Sub-Kelvin Cryocoolers for Quantum and Defense Applications"
author: "Data Center Dynamics / DARPA"
url: https://www.datacenterdynamics.com/en/news/darpa-plans-to-research-modular-sub-kelvin-cryocoolers-that-dont-use-helium-3/
date: 2026-01-27
domain: space-development
secondary_domains: [ai-alignment]
format: news
status: processed
processed_by: astra
processed_date: 2026-04-04
priority: high
tags: [helium-3, DARPA, cryocooler, quantum-computing, defense, he3-alternatives, cislunar-resources, substitution-risk]
flagged_for_theseus: ["DARPA urgency on He-3-free cooling implies US defense quantum computing is supply-chain constrained on He-3 — AI hardware supply chain implications"]
extraction_model: "anthropic/claude-sonnet-4.5"
---

## Content

**Date of DARPA call:** January 27, 2026 (described as "urgent" in program language)
**Source:** Data Center Dynamics report on DARPA BAA announcement

**What DARPA is seeking:**
DARPA issued an urgent call for proposals to develop modular, helium-3-free cooling systems for next-generation quantum and defense technologies. Specifically:
- Modular, interconnected cryocoolers with sub-kelvin stages
- No helium-3 required
- Thermally conductive interconnections allowing multiple systems to be cooled simultaneously
- Motivation: "lack of temperature-stable, sub-kelvin cryocoolers not requiring helium-3"

**Why DARPA calls this urgent:**
Helium-3 is used for: nuclear smuggling detection, nuclear fusion research, medical machines, and quantum computers. He-3 "has perpetually been in short supply." The word "urgent" in a DARPA BAA signals a Department of Defense assessment that this supply dependency is a strategic vulnerability requiring accelerated solution development.

**Technical goal:**
Sub-kelvin (< 1K) cooling without He-3. For superconducting qubits specifically, this means reaching 10-25 mK — well below the 1K threshold. DARPA likely seeking ADR-based or other He-3-free approaches capable of reaching these temperatures in a modular, scalable configuration.

**Market implications:**
The defense quantum computing market is a substantial fraction of total He-3 demand. If DARPA produces deployable He-3-free systems within a 2-4 year timeline (typical for "urgent" DARPA programs), the US military quantum computing installations would systematically migrate away from He-3 before Interlune begins deliveries (2029 target).

**Timing context:**
- January 27, 2026: DARPA issues urgent call
- February 2026: Chinese researchers publish EuCo2Al9 Nature paper (He-3-free ADR alloy, 106 mK)
- LEMON project already achieved sub-30 mK in March 2025 (predating DARPA call)
- KYb3F10 JACS paper (27.2 mK) published July 2025 (also predating DARPA call)

The DARPA call appears to reflect awareness of research progress (sub-30 mK achievable) and urgency to commercialize for defense applications.

## Agent Notes
**Why this matters:** DARPA's "urgent" designation is a significant signal — it means the US defense establishment has assessed He-3 supply as a strategic vulnerability and is actively seeking to eliminate the dependency. Defense quantum computing is a major He-3 demand segment (governments fund large-scale quantum installations). Systematic defense exit from He-3 demand would remove a significant buyer segment before Interlune begins deliveries.

**What surprised me:** The timing — DARPA issued this call just after research systems demonstrated sub-30 mK (LEMON, March 2025; KYb3F10 JACS, July 2025). DARPA likely knows about these achievements and is trying to accelerate commercialization. This is not DARPA funding basic research — it's trying to bridge the gap from research milestone to deployable defense system.

**What I expected but didn't find:** Specific BAA program name or number. Response organizations/awardees. Specific temperature targets (sub-kelvin is the stated minimum, but 10-25 mK for superconducting qubits would be the harder and more relevant target). Funding level.

**KB connections:**
- Pattern 7 (He-3 demand substitution is geopolitically structured): DARPA program confirms US geopolitical dimension of He-3-free development
- space resource rights are emerging through national legislation: The US government is simultaneously enabling He-3 extraction (DOE first purchase) and trying to eliminate defense He-3 dependence (DARPA) — a genuinely contradictory position
- Interlune DOE contract (3 liters by April 2029): DOE is buying He-3 even as DARPA is trying to eliminate He-3 dependence — different agencies, different time horizons

**Extraction hints:**
- **Primary claim candidate:** "DARPA's January 2026 urgent call for He-3-free sub-kelvin cryocoolers signals that US defense quantum computing will systematically exit He-3 demand as alternatives mature — removing a substantial buyer segment before Interlune achieves commercial extraction scale"
- **Scope qualifier:** Timeline uncertainty — "urgent" DARPA programs can take 2-15 years to deployable systems; the urgency designation suggests 2-4 year target, but this is not guaranteed
- **Counter-evidence note:** DOE purchasing He-3 from Interlune simultaneously suggests US government is hedging rather than committing to He-3 exit

## Curator Notes
PRIMARY CONNECTION: Pattern 4 (He-3 demand temporal bound) — DARPA urgency is institutional evidence that the US defense market intends to exit He-3 dependence
WHY ARCHIVED: US defense is a major He-3 demand segment; DARPA urgency is not a speculative indicator but an institutional signal of planned demand reduction
EXTRACTION HINT: Frame as complementary to LEMON and KYb3F10 findings — three independent pressures (European research program, Chinese materials science, US defense commercialization) all pointing at He-3-free alternatives reaching qubit temperatures within Interlune's delivery window
